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package catalog
import (
"errors"
"fmt"
"github.com/kyleconroy/sqlc/internal/sql/ast"
"github.com/kyleconroy/sqlc/internal/sql/sqlerr"
)
type Type interface {
isType()
SetComment(string)
}
type Enum struct {
Name string
Vals []string
Comment string
}
func (e *Enum) SetComment(c string) {
e.Comment = c
}
func (e *Enum) isType() {
}
type CompositeType struct {
Name string
Comment string
}
func (ct *CompositeType) isType() {
}
func (ct *CompositeType) SetComment(c string) {
ct.Comment = c
}
func sameType(a, b *ast.TypeName) bool {
if a.Catalog != b.Catalog {
return false
}
// The pg_catalog schema is searched by default, so take that into
// account when comparing schemas
aSchema := a.Schema
bSchema := b.Schema
if aSchema == "pg_catalog" {
aSchema = ""
}
if bSchema == "pg_catalog" {
bSchema = ""
}
if aSchema != bSchema {
return false
}
if a.Name != b.Name {
return false
}
return true
}
func (c *Catalog) createEnum(stmt *ast.CreateEnumStmt) error {
ns := stmt.TypeName.Schema
if ns == "" {
ns = c.DefaultSchema
}
schema, err := c.getSchema(ns)
if err != nil {
return err
}
// Because tables have associated data types, the type name must also
// be distinct from the name of any existing table in the same
// schema.
// https://www.postgresql.org/docs/current/sql-createtype.html
tbl := &ast.TableName{
Name: stmt.TypeName.Name,
}
if _, _, err := schema.getTable(tbl); err == nil {
return sqlerr.RelationExists(tbl.Name)
}
if _, _, err := schema.getType(stmt.TypeName); err == nil {
return sqlerr.TypeExists(tbl.Name)
}
schema.Types = append(schema.Types, &Enum{
Name: stmt.TypeName.Name,
Vals: stringSlice(stmt.Vals),
})
return nil
}
func stringSlice(list *ast.List) []string {
items := []string{}
for _, item := range list.Items {
if n, ok := item.(*ast.String); ok {
items = append(items, n.Str)
}
}
return items
}
func (c *Catalog) getType(rel *ast.TypeName) (Type, int, error) {
ns := rel.Schema
if ns == "" {
ns = c.DefaultSchema
}
s, err := c.getSchema(ns)
if err != nil {
return nil, -1, err
}
return s.getType(rel)
}
func (c *Catalog) createCompositeType(stmt *ast.CompositeTypeStmt) error {
ns := stmt.TypeName.Schema
if ns == "" {
ns = c.DefaultSchema
}
schema, err := c.getSchema(ns)
if err != nil {
return err
}
// Because tables have associated data types, the type name must also
// be distinct from the name of any existing table in the same
// schema.
// https://www.postgresql.org/docs/current/sql-createtype.html
tbl := &ast.TableName{
Name: stmt.TypeName.Name,
}
if _, _, err := schema.getTable(tbl); err == nil {
return sqlerr.RelationExists(tbl.Name)
}
if _, _, err := schema.getType(stmt.TypeName); err == nil {
return sqlerr.TypeExists(tbl.Name)
}
schema.Types = append(schema.Types, &CompositeType{
Name: stmt.TypeName.Name,
})
return nil
}
func (c *Catalog) alterTypeRenameValue(stmt *ast.AlterTypeRenameValueStmt) error {
ns := stmt.Type.Schema
if ns == "" {
ns = c.DefaultSchema
}
schema, err := c.getSchema(ns)
if err != nil {
return err
}
typ, _, err := schema.getType(stmt.Type)
if err != nil {
return err
}
enum, ok := typ.(*Enum)
if !ok {
return fmt.Errorf("type is not an enum: %T", stmt.Type)
}
oldIndex := -1
newIndex := -1
for i, val := range enum.Vals {
if val == *stmt.OldValue {
oldIndex = i
}
if val == *stmt.NewValue {
newIndex = i
}
}
if oldIndex < 0 {
return fmt.Errorf("type %T does not have value %s", stmt.Type, *stmt.OldValue)
}
if newIndex >= 0 {
return fmt.Errorf("type %T already has value %s", stmt.Type, *stmt.NewValue)
}
enum.Vals[oldIndex] = *stmt.NewValue
return nil
}
func (c *Catalog) alterTypeAddValue(stmt *ast.AlterTypeAddValueStmt) error {
ns := stmt.Type.Schema
if ns == "" {
ns = c.DefaultSchema
}
schema, err := c.getSchema(ns)
if err != nil {
return err
}
typ, _, err := schema.getType(stmt.Type)
if err != nil {
return err
}
enum, ok := typ.(*Enum)
if !ok {
return fmt.Errorf("type is not an enum: %T", stmt.Type)
}
newIndex := -1
for i, val := range enum.Vals {
if val == *stmt.NewValue {
newIndex = i
}
}
if newIndex >= 0 {
if !stmt.SkipIfNewValExists {
return fmt.Errorf("type %T already has value %s", stmt.Type, *stmt.NewValue)
} else {
return nil
}
}
enum.Vals = append(enum.Vals, *stmt.NewValue)
return nil
}
func (c *Catalog) dropType(stmt *ast.DropTypeStmt) error {
for _, name := range stmt.Types {
ns := name.Schema
if ns == "" {
ns = c.DefaultSchema
}
schema, err := c.getSchema(ns)
if errors.Is(err, sqlerr.NotFound) && stmt.IfExists {
continue
} else if err != nil {
return err
}
_, idx, err := schema.getType(name)
if errors.Is(err, sqlerr.NotFound) && stmt.IfExists {
continue
} else if err != nil {
return err
}
schema.Types = append(schema.Types[:idx], schema.Types[idx+1:]...)
}
return nil
}
func (c *Catalog) renameType(stmt *ast.RenameTypeStmt) error {
if stmt.NewName == nil {
return fmt.Errorf("rename type: empty name")
}
newName := *stmt.NewName
ns := stmt.Type.Schema
if ns == "" {
ns = c.DefaultSchema
}
schema, err := c.getSchema(ns)
if err != nil {
return err
}
ityp, idx, err := schema.getType(stmt.Type)
if err != nil {
return err
}
if _, _, err := schema.getTable(&ast.TableName{Name: newName}); err == nil {
return sqlerr.RelationExists(newName)
}
if _, _, err := schema.getType(&ast.TypeName{Name: newName}); err == nil {
return sqlerr.TypeExists(newName)
}
switch typ := ityp.(type) {
case *CompositeType:
schema.Types[idx] = &CompositeType{
Name: newName,
Comment: typ.Comment,
}
case *Enum:
schema.Types[idx] = &Enum{
Name: newName,
Vals: typ.Vals,
Comment: typ.Comment,
}
default:
return fmt.Errorf("unsupported type: %T", typ)
}
// Update all the table columns with the new type
for _, schema := range c.Schemas {
for _, table := range schema.Tables {
for _, column := range table.Columns {
if column.Type == *stmt.Type {
column.Type.Name = newName
}
}
}
}
return nil
}